<template>
  <div class="app-container">
    <!-- 输入表单 -->
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" />
      </el-form-item>
      <el-form-item label="入驻时间">
        <el-date-picker v-model="teacher.joinDate" value-format="yyyy-MM-dd" />
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" :min="0" />
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
            -->
          <el-option :value="1" label="高级讲师" />
          <el-option :value="2" label="首席讲师" />
        </el-select>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" />
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" :rows="10" type="textarea" />
      </el-form-item>

      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">
        <el-upload :show-file-list="false" :on-success="handleAvatarSuccess" :before-upload="beforeAvatarUpload"
          :on-error="handleAvatarError" :action="BASE_API + '/admin/vod/file/upload'" class="avatar-uploader">
          <img v-if="teacher.avatar" :src="teacher.avatar">
          <i v-else class="el-icon-plus avatar-uploader-icon" />
        </el-upload>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="saveOrUpdate()">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import teacherApi from '@/api/vod/teacher'
export default {
  data() {
    return {
      BASE_API: 'http://localhost:8301',
      // 初始化讲师默认数据
      teacher: {
        sort: 0,
        level: 1
      },
      BASE_API: 'http://localhost:8301',
      saveBtnDisabled: false // 保存按钮是否禁用，防止表单重复提交
    }
  },
  // 页面渲染成功
  created() {
    if (this.$route.params.id) {
      this.fetchDataById(this.$route.params.id)
    }
  },
  methods: {
    // 上传成功回调
    handleAvatarSuccess(res, file) {
      // console.log(res)
      if (res.code == 20000) {
        // console.log(res)
        this.teacher.avatar = res.data
        // 强制重新渲染
        this.$forceUpdate()
      } else {
        this.$message.error('上传失败 （非0）')
      }
    },

    // 错误处理
    handleAvatarError() {
      console.log('error')
      this.$message.error('上传失败（http失败）')
    },

    // 上传校验
    beforeAvatarUpload(file) {
      const isJPG = file.type === 'image/jpeg'
      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    },
    //根据id查询讲师信息
    fetchDataById(id) {
      teacherApi.getTeacherById(id)
        .then(resp => {
          this.teacher = resp.data
        })
    },
    saveOrUpdate() {
      this.saveBtnDisabled = true
      if (!this.teacher.id) {
        this.saveTeacher()
      } else {
        this.updateTeacher()
      }

    },
    //保存讲师
    saveTeacher() {
      teacherApi.saveTeacher(this.teacher)
        .then(res => {
          this.$message({
            type: 'success',
            message: '添加成功'
          })
          this.$router.push({ path: '/vod/teacher/list' })
        })
    },
    //更新讲师
    updateTeacher() {
      teacherApi.updateTeacher(this.teacher)
        .then(resp => {
          this.$message({
            type: 'success',
            message: '更新成功'
          })
          this.$router.push({ path: '/vod/teacher/list' })
        })
    }
  }
}
</script>

<style scoped>
.avatar-uploader .avatar-uploader-icon {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;

  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}

.avatar-uploader .avatar-uploader-icon:hover {
  border-color: #409EFF;

}

.avatar-uploader img {
  width: 178px;
  height: 178px;
  display: block;
}
</style>